/*
 * MIT License
 *
 * Copyright (c) 2020 wen.gu <454727014@qq.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

 /***************************************************************************
  * Name: mp_buffer_queue.cpp
  *
  * Purpose: buffer_queue implementation for micro player
  *
  * Developer:
  *   wen.gu , 2020-08-04
  *
  * TODO:
  *
  ***************************************************************************/


/******************************************************************************
**    INCLUDES
******************************************************************************/

#include "mp_buffer_queue.h"
/******************************************************************************
**    MACROS
******************************************************************************/

/******************************************************************************
**    VARIABLE DEFINITIONS
******************************************************************************/



/******************************************************************************
**    FUNCTION DEFINITIONS
******************************************************************************/
void MPBufferQueue::clear()
{
    for (auto it : mBuffers)
    {
        if (it)
        {
            it->release();
        }
    }

    mBuffers.clear();
}

void MPBufferQueue::push(MPBuffer* buf)
{
    AutoLock al(mLock);
    mBuffers.push_back(buf);
    if (mBuffers.front() == buf)
    {
        /** before current push,the list is empty,so, notify the wait() */
        mCond.notify_one();
    }    
}

MPBuffer* MPBufferQueue::pop(uint32_t timeOutMs /*= 20 */) /**default timeout 20 milli-second */
{
    AutoLock al(mLock);
    MPBuffer* ret = nullptr;
    if (mBuffers.empty())
    {
         if (mCond.wait_for(al, std::chrono::milliseconds(timeOutMs)) == std::cv_status::no_timeout)
        {
            ret = mBuffers.front();
            mBuffers.pop_front();
            return ret;
        }     
    }
    else
    {
        ret = mBuffers.front();
        mBuffers.pop_front();
        return ret;
    }

    return ret;
}

